BART’s chief spokesman Linton Johnson says it’s possible the money could be set aside for a rainy day.

There’s nothing in that reserve fund, so the staff is suggesting to the board to put it in the Capital Reserve Fund. $4 million seems like a lot of money to a lot of folks, but when you compare it to a half a billion dollar budget, it’s 0.4 percent. Some people call that decimal dust, or a rounding error. It sounds like a lot, but really in the grand scheme of things it’s not much,” said Johnson.

Johnson added that the recommendation will formally be made at the next board meeting.